Flashcards in Pump Ops Chpt 5 Deck (69)

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1

## Below 32 degrees water is converted to a solid state of matter called

### Ice

2

## For fire protection purposes ordinary fresh water is considered to weigh _____ or _____ a gal

### 62.4 lb/ft or 8.3lb/gal

3

## Water may also used to smother fires in combustible liquids whose specific gravity is higher than ____

### 1

4

## In this manual pressure is defined as _________.

### Force per unit area

5

## Pressure is easily confused with _______. _________ is a simple measure of weight and is expressed in pounds or kilograms

### Force

6

## The height required for a 1 square inch column of water to produce 1 psi at its base equals 1 foot divided by ________.

### 0.434 psi/ft or 2.304 feet

7

## Therefore a column of water 2.304 feet high exerts pressure of _______ psi at its base.

### 1

8

## In metrics a cube that is 0.1 m x 0.1 m x 0.1 m x holds _____ liter of water.

### 1

9

## The weight of 1 liter of water is ______ kilogram

### 1

10

## One cubic meter of water holds 1000 liters of water and weighs _________ kg

### 1000

11

## The speed at which a fluids travels through a hose or pipe is determined by the pressure upon the fluid as well as The size of the office through which it is flowing. The speed is often called ______

### Velocity

12

## Fluid pressure is perpendicular to any surface on which it acts

### First principle

13

## Fluid pressure at a point in fluid at rest is the same intensity in all directions. This principle is used in hydrostatic testing

### Second principle

14

## Pressure applied to a confined fluid is transmitted equally in all directions

### Third principle

15

## The pressure of a liquid in an open vessel is proportional to its depth

### Fourth principle

16

## The pressure of a liquid in an open vessel is proportional to the density of the liquid

### Fifth Principle

17

## The pressure of a liquid at the bottom of a vessel is independent of the shape of the vessel.

### Sixth principle

18

## This pressure is greatest at low altitudes and least at very high altitudes ________ at sea level is 14.7

### Atmospheric pressure

19

## Any pressure less than atmospheric pressure is called_______, and absolute zero pressure is called a _____.

### Vacuum and perfect vacuum

20

## In the fire service, _____ refers to the height of a water supply above the discharge orifice

### Head

21

## To convert head in feet to head pressure, you must divide the number of feet by ______.

### 2.304

22

## The water flow definition of _____ is stored potential energy available to force water through pipes, fittings, hose, and adapters.

### Static pressure

23

## Is the portion of the total available pressure not used to overcome friction loss or gravity while forcing water through pipes, fittings, hoses, or adapters.

### Residual pressure

24

## While water is flowing from a discharge opening the forward velocity pressure is considered

### Flow pressure

25

## Use a pitot tube and gauge to measure the forward velocity of the _______.

### Flow pressure

26

## Refers to the center line of the pump or the bottom of a static water supply source above or below ground level.

### Elevation

27

## Is the position of an object in relation to sea level

### Altitude

28

## When a nozzle is above the level of the pump, there is pressure loss. Conversely when a nozzle is below the pump, there is a pressure gain. The pressure losses or gains due to gravity are called ______.

### Elevation pressure

29

## Above sea level atmospheric pressure decreases approximately _______ for every 1000 feet.

### 0.5psi

30